Demountable tire and rim



Nl. C. SCHWEINERT.

DEMOUNTABLE TIRE AND RIM. APPLICATION FILED MAR. 4, I9Iov 1,164,963. Patented 1160.21, 1915 Eg] Fia 'INVENTOR UNITED STATESr PATENT OFFICE.

-IVIAXIMILIAN CHARLES SCHWEINERT. 0F WEST HOBOIKEN, NEW J' ERSEY.

DEBEGUNTABLE TIRE AND Specification of Letters Patent.

Patented pee. 21, 1915.

application mea March 4, 1910. seal no. 547,252.

vide a rim which is detachable from the felly of the vehicle wheel, such rim having means for holding a pneumatic tire in position thereon, so that the latter may be carried in an inflated condition detached from the wheel, and substituted for any of the tires of the vehicle in case of accident. Such demountable tires have gone largely into use because of the rapidity with which they can be substituted for the injured tire so that the necessity for lengthy stoppages on the road has been avoided. Because ofthe difficulty in removing the tire fromthe rim, it has been proposed -to split the rim circumferen tially so that the tire may be placed over one section and the other section adjusted in position. This has involved the necessity of holding the sections together before the tire and rim are placed upon the felly. A number of types suggested for this purpose, but so far as I ani aware none of these is capable of withstanding the very heavy separating strain whichv is placed upon the rim sections by the inflation of the tire. After numerous eX- per'nnents I have discovered a means for holding the rim sections tog'etlrer which cannot be separated by the pressure Within the tire, and which is of .simple construction and of easy application. T o this end I provide a demountable rim split circumferentiallv into two parts, and as a holdin means I provide a supplemental rim which is made in sections, which rim has side lianges which engage the side flanges of the tire rim. Preferably such supplemental rim is a complete rim i i'nade in two or more sections, preferably four, so that it-may be. easily adjusted in position. It is not strictly essential that the sul'iplemental rim extend entirely around the tire rim. In other words, such supplemental rim may consist of a series of rim sections. It is important, however, if not essential.

of fastening means have beenY that theserim' sections be of considerable length in order that they shall have an a,- preciable curve corresponding t0 the inner curve of the tirewrifn'.` This 'curved shape very `materially indreases the strength and rigidity, of the supplemental rim sections, and provides a holding means of v great strengthv relatively to the thiclmess of the metal. v l

In the drawings, whereinI have shown one embodiment of my invention,-Figure 1 is a transverse section through a tire and rim illustrating the invention in its preferred form. Fig. 2 is a side elevation of a portion of the tire and rim. Fig. 3 is an elevation, partly in section ofthe rim andtire. Fig. 4 1s a transverse section taken through one of the stay bolts.

Referring to the drawings, let A indicate a suitable pneumatic tire having anouter shoe B and an inner air tube C. The tire is mounted upon a rim D being retained thereon by enlargements or flanges E which lit in channels formed in the rim, clamping blocks or spreaders F (Fig. 4) being usually provided for holding the tire in place. So far as these features are concerned theymay be of any suitable construction, although my 'invention is of perhaps the greatest import-j, Vance 1n connection with the fastening means shown, which are well-known and in eX- tended use.

The rim D is split circumferentially into two parts such as a and b. Preferably the rim is split at 'its middle so that holes f for the passage of the spreaders F, when the latter are used are formed partly in eachI I section, although the split may be provided at any other point if desired. In the preferred form of the invention these rim sections are held together by a supplemental rim G having side'flanges z' which are adapted to enga ge the flanges of the tire rim.

The rim G is adapted to be applied to the rim D by a movement radially outward, and in order to facilitate this application the rim G is cut transversely at one or moreplaces, preferably so that the rim is divided into four sections. In Fig. 3 I have shown the sections as hinged together at d el. Of course, in this construction at least two abutting sections will not be hinged but these -may be connected when the supplemental l (Fig. 4) fthe rim D may be providedwith apertures f through which the shank o f the stay bolt passes and the rim G may be profvided .with suitable apertures g-large enough to receive the nutlz. ofthe spreader. Or if desired the aperture g may be reduced to the size of the aperture and th, nuts h engage the inner side of therim G. so that they hold the latter in place. When no staybolts 'or spreader/s are used, the sections of the rij' G may be imperforate. Y

By reason of this construction the operation of fitting a tire upon the rim D is eX- tremely short and simple. One section of the rim, such as b, is placed upon the floor orv a table, the inner tube adjusted in the outer shoe and the latter laid over the section so that its lower enlargement E fits the channel' of lsuch section. The series of speaders F areffthen placed in p osition so that their studs extend through the holes f whereupon the section a is adjusted in place upon its section yI), the upper enlargement E fittingeasily within the channel ofthe rim. The rim G (being in a-somewhat oollapsed condition) is then adjusted outwardly over the rim D until the rim G is fully eX- panded whereupon the bolt may be passed through the meeting edges o-f the rim G and the latter thus secured in place. The flanges z' of the rim G (Fig. 1) may be so constructed astofitexactly over the rimv D, or they may lit more or less loosely so as tov permit a slight expansion of the sections a b' after the rim 1s 1n place. Or they may be votherwise constructed to secure any desired result. If necessary during the operation of fitting a tire uponthe rim D any suitable tools may be provided for holding the spreaders F in place, valthough this ,will not ordinarily be required as such spreaders are easily arranged'in positionbefore the top section of the rim is applied. ,This is not so, however,

in .the case of an undivided rim, when the use of a tool is practically'necessary, .particularly in the case of detachable rims wherein the studs orbolts fj are `necessarily very short. In mounting Athe tire in this manner there is little or no dangerof pinching the inner air tubesince its postion'is easily as-l certained and controlled prior to the application of the upper section of the rim, and such application has no particular effect to alter its position. 'Ifdesired the air tube can be inflated slightly prior to or during the mounting of the tire upon the rim, although thisis not ordinarily necessary.

After the tire is mounted upon the rim it may be inflated to full running pressure and carried upon the car or othervehicle ready for immediate attachment to the wheel.

y' "Thltire, and rimmay be attached to the l. fellyofxthe wheel in any suitable manner.

In the drawings I haveshown one-form of attaching means which comprises a metal fixed rim m fixed to the felly n and provided with an outwardly extending flange o at one side which supports one sideof the tire rim D. Bolts p are provided at intervals around the felly which are formed with heads g bearing against the rim m. At their opposite ends the bolts p are screw-threaded and pass through Wedglng blocks r, the latter being forced inwardly between the rim Gr and the metal rim m by nuts s as shown. The

wedges r extend outwardly so that they en-V gage the rim Gr laterally, 'and thus prevent any sidewise movement of the rim and support 'the latter at the proper points. A se ries of wedges are provided spaced around the wheel," with the eect that thel tire rim D is wedged outwardly and laterally until it is immovable with relation tothe felly. Any other suitable attaching means may be provided in lieu .of that shown.

Although the specific construction shown and .described is preferred, it is notstrictlyl necessary that the rim G be a complete rim or that its sections be united. Each of the l' sections of the rim should preferably, however, be of .considera-ble length in order that they may assume a curved shape, since this curved shape very materially increases the strength of the section. In other words,

the flanges z' are much better adapted to resist a lateral strain if they are of such length as to give them a substantial curve.l It is practically essential that the rim Gr or its equivalent be provided with the flanges i contacting with the flanges ofthe tire rim. I have found in practicethat the pressure developed in agfully inflated automobile tire is so ygreat that the sections of the tirerim are extremely aptto become distorted and separate unless they are held. together by a member or members such as G, wherein flanges are provided which form a channel within which-the tire rim rests, While the rim G is shown as composed of connected sec'- tions, it is obvious that these may be disconnected if desired, although the construction shown is much to be preferred.

It will be observed in the construction shown and described that thel circumferen- -tially split or tire holding rim `presents great strength against-radially inward pressure, and that the supplementary rim preformed in a pluralityl of circumferential circling member extending substantially around said rim and having side flanges extending radially outwardly in a plane beyond the side flanges of said rim, and forming lateral abutments adapted to sustain the force tending to separate the circumferential parts of said rim, said inner encircling member comprising a plurality of transversely jointed sections movable into and' out of engagement with said rima' 2. A demountable rim for tires, comprising a rim having tire engaging flanges, and formed in a plurality of circumferential parts, and means for locking the circumferential parts of said rim against separation, said means comprising a supplementary inner encircling rim extending substantially around said rim and having radially outwardly extending side flanges adapted to engage the flanges of said lirst named rim and form lateral abutments therefor, said supplementary rim comprising a plurality of transversely hinged sections movable into and out of engagement with said firstnamed rim.

3. A'demountable rim for tires, comprising a rim havingl tire engaging flanges and formed in a plurality of circumferential parts having a combined Width substantially equal to the Width of the base of the tire to which the rim is fitted, and adapted to sustain the inward strains of said tire on the rim, and means for locking the circumferential parts of said rim against separation, said means comprising a supplementary inner encircling rim of greater Width than said rim having the circumferential parts, said inner encircling rim having side flanges adapted to engage the tire engaging flanges of said first named rim and form lateral abutments therefor, said supplementary rim comprising a plurality of adjoining sections extending substantially around said rim and adapted to sustain the transverse strains exerted by said tire on said first-named rim.

4; A demountable rim for tires, comprising a rim having tire engaging flanges and formed in a plurality of circumferential parts having a combined Width substantially equal to the Width of the base of the tire to i which the rim is fitted, and adapted to sustain the inward strains of said tire on the v rim, and means for locking the circumferen- Copes of this patent may be obtained for tial parts of said rim against separation,-

said means comprising a supplementary inner encircling rim of greater Width than said A.rim having the circumferential parts, said 1nner encircling rim having side flanges adapted to engage the tire-engaging flanges' of said first named rim and form `lateral abutments therefor, saidv supplementary rim comprising a plurality of transversely jointed sections movable into and out of engagement With said first named rim, extending substantially around said rim and adapted to sustain the transverse strains exerted by said tire on said rst named rim.`

5. A demountable rim for tires, comprising a rim having tire engaging flanges and formed in a plurality of circumferential parts adapted to laterally abut and having a combined width substantially equal to the Width of the base of -the tire to which the rim is fitted, and adapted-to sustain the inward strains of `said tire on the rim, and means for locking the'circumferential parts of said rim against separation, said means comprising a supplementary inner encircling rim of greater Width than said rim having the circumferential parts, said inner encircling rim having side flanges adapted to engage the tire engaging flanges of saidadapted to sustain the transverse strains exerted by said. tire on said first named rim.

6. A demountable rim for tires, comprising a rim having tire engaging flanges and formed yin a plurality of circumferential parts, and means for locking the circumferential parts of sai'd rim against separation, said means comprising a supplementary inner encircling rim extending substantially around said rim and having radially out- Wardly extending substantially straight side flanges adapted to engage the tire 'engaging flanges of said first-named rim and form lateral abutments therefor, said supplementary rim comprising a'plurality of joined arc-shaped sections.

AIn Witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

MAXIMILIAN CHARLES SCHWEINERT.

WVitnesses EUGENE MYLES, FRED WHiTn.

five cents each, by addressing the Commissioner of Eatents., Washington, D. C. 

